/*
 * Copyright 2007 Rob Nielsen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.proxymatic.core.handlers.method;

import com.googlecode.proxymatic.core.AbstractMethodHandler;
import com.googlecode.proxymatic.core.BuildtimeContext;
import com.googlecode.proxymatic.core.MethodInvoker;
import com.googlecode.proxymatic.core.ProxyBuilder;
import com.googlecode.proxymatic.core.ReturnTypeModifier;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

public class ConstructorMethodHandler extends AbstractMethodHandler {

    protected MethodInvoker tryFindConstructor(Method method, Class constructorClass, Class[] parameterTypes, ParameterModifier parameterModifier, ReturnTypeModifier returnTypeModifier) {
        if (!returnTypeModifier.supportsReturnType(constructorClass, method.getReturnType())) {
            return NOT_HANDLED;
        }
        try {
            Constructor constructor = constructorClass.getConstructor(parameterTypes);
            return new ConstructorMethodInvoker(constructor, parameterModifier, returnTypeModifier);
        } catch (NoSuchMethodException e) {
            return NOT_HANDLED;
        }
    }

    public MethodInvoker getInvoker(Method method, BuildtimeContext context, ProxyBuilder proxyBuilder) {
        if (context.isImplementationAvailableAtRuntime()) {
            return NOT_HANDLED;
        }
        Class[] parameterTypes = method.getParameterTypes();
        for (Class implementationClass : context.getImplementationClasses()) {
            MethodInvoker methodInvoker = tryFindConstructor(method, implementationClass, parameterTypes, ParameterModifier.NO_MODIFICATIONS, ReturnTypeModifier.NO_MODIFICATIONS);
            if (methodInvoker != NOT_HANDLED) {
                return methodInvoker;
            }
        }
        return NOT_HANDLED;
    }
}
